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BUG: raise error for groupby() with invalid tuple key #18826

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Merged
merged 1 commit into from
Dec 19, 2017
Merged

BUG: raise error for groupby() with invalid tuple key #18826

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1 change: 1 addition & 0 deletions doc/source/whatsnew/v0.22.0.txt
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Expand Up @@ -310,6 +310,7 @@ Groupby/Resample/Rolling
^^^^^^^^^^^^^^^^^^^^^^^^

- Bug when grouping by a single column and aggregating with a class like ``list`` or ``tuple`` (:issue:`18079`)
- Fixed regression in :func:`DataFrame.groupby` which would not emit an error when called with a tuple key not in the index (:issue:`18798`)
-
-

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2 changes: 1 addition & 1 deletion pandas/core/groupby.py
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Expand Up @@ -2977,7 +2977,7 @@ def is_in_obj(gpr):


def _is_label_like(val):
return (isinstance(val, compat.string_types) or
return (isinstance(val, (compat.string_types, tuple)) or
(val is not None and is_scalar(val)))


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1 change: 0 additions & 1 deletion pandas/tests/groupby/test_groupby.py
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Expand Up @@ -2750,7 +2750,6 @@ def test_tuple_warns_unhashable(self):

assert "Interpreting tuple 'by' as a list" in str(w[0].message)

@pytest.mark.xfail(reason="GH-18798")
def test_tuple_correct_keyerror(self):
# https://github.com/pandas-dev/pandas/issues/18798
df = pd.DataFrame(1, index=range(3),
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